Surface properties of polypropylene/organoclay nanocomposites

Ataeefard, Maryam; Moradian, Siamak

doi:10.1016/j.apsusc.2010.09.096

Cited by 61 publications

(47 citation statements)

References 18 publications

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“…By adding PW with a non-polar structure, the surface energy of the polar part in the composite films decreased significantly. The surface energies of the dispersive part, which are related to the surface roughness [21,22,48], increased slightly from 32.0 to 35.7 mJ/m 2 at PW contents of up to 30 %, and then decreased slightly. This trend is consistent with that of the AFM surface roughness.…”

Section: Morphological Structurementioning

confidence: 91%

“…The surface free energies (γ s ) of the LDPE/PW composite films were estimated via the OwensWendt method, utilizing the theory of adhesion work between solid and liquid phases. That is, surface free energies (γ s ) could be derived by summing polar (γ P ) and non-polar or dispersive energies (γ D ) [21,22]. Furthermore, the solubility parameter (δ), an indicator for the hydrophobicity of a polymer surface, was calculated from Eq.…”

Section: Characterizationmentioning

confidence: 99%

“…For the pure PW and the LDPE/ PW composite films, the total surface free energies were calculated via the Owens-Wendt method, utilizing the contact angle measurement of deionized water and diiodomethane [21]. The total surface free energies are the sum of the polar part and dispersive part [21,22]. As shown in Fig.…”

Section: Morphological Structurementioning

confidence: 99%

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Effects of the paraffin wax (PW) content on the thermal and permeation properties of the LDPE/PW composite films

et al. 2015

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A series of low density polyethylene/paraffin wax (LDPE/PW) composite films were fabricated via a twin-screw extruder, and their morphologies, thermal properties, gas and vapor permeations, and surface properties were interpreted as functions of the PW contents. The PW was well dispersed into the LDPE matrix at low PW contents, whereas phase separation and an increase in surface roughness occurred with increasing PW content. The parameter results of surface properties such as contact angle, surface free energy, and solubility showed that the hydrophobicity of the LDPE/PW composite films also increased, and their phase changes and permeation properties were significantly dependent on the PW contents in the LDPE matrix. With increasing PW contents, both the oxygen transmittance rate (OTR) and water vapor transmittance rate (WVTR) of the LDPE/PW composite films decreased at a relatively low measuring temperature (23°C), and increased at a relatively high temperature (48°C). These results relate to the morphological structure (including tortuous paths and crystallinity) of the composite films via the incorporation of PW.

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Section: Morphological Structurementioning

confidence: 91%

Section: Characterizationmentioning

confidence: 99%

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Effects of the paraffin wax (PW) content on the thermal and permeation properties of the LDPE/PW composite films

et al. 2015

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“…In X-rays analysis at high diffraction angles, Figure 3 Where K, known as Scherrer`s constant (shape factor), ranges from 0.9 to 1.0, is the wavelength of the X-Ray radiation source, ½ is the width of the XRD peak at half height and is the Bragg angle. Disappearance of the nanoclay interlayer diffraction Peak (d 001 ) indicates possible exfoliation of the nanoclay platelets and broadening of the peak is considered to be the result of partial exfoliation 18 . The results indicate the formation of microstructures predominantly exfoliated in film PP-clay-Ag.…”

Section: Resultsmentioning

confidence: 99%

Processing and antimicrobial efficacy of polypropylene/montmorillonite/silver nanocomposites as food packaging films

Oliani¹,

Komatsu²,

Lincopán³

et al. 2016

AIP Conference Proceedings

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Multifunctional chitosan nanocomposites: The effect of silver supported on montmorillonite platelets on barrier and mechanical properties AIP Conference Proceedings 1599, 442 (2014) Abstract -The aim this study was to use nanocomposites of polypropylene (PP), montmorillonite (MMT) and silver nanoparticles (AgNPs), prepared by melt intercalation in a twin-screw extruder, as a food packaging bactericide material. The use of nanoclay and nanosilver as additives for polymer matrices requires, in some cases (with non-polar matrices) the use of a compatibilizer agent which will act as a bridge or permanent buffer for nanoclay-nanosilver-matrix interaction. As compatibilizer agent it has been used a propylene graft maleic anhydride copolymer (PP-g-MA). The nanocomposites were evaluated by differential scanning calorimetry (DSC), X-Rays diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and determination of antibacterial activity. The results indicate the formation of microstructures predominantly exfoliated. Further, the antibacterial properties of the films were investigated against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) bacteria.

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“…Nanocomposites are an exciting class of materials, spawning academic interest due to their substantial improvement of a range of properties, such as thermal, mechanical and physical properties (Giannelis, 1996;Wang et al, 2005;Zhao et al, 2005;Ataeefard and Moradian, 2011;Gonzalez et al, 2014). Whereas layered silicate nanocomposites refer to the resultant materials obtained from the intercalation or dispersion of silicate layers (filler) within a polymeric matrix (Alexandre and Dubois, 2000;Pavlidou and Papaspyrides, 2008), bionanocomposites specifically designate the use of polymers that are derived from renewable resources and are biodegradable (Rhim et al, 2013).…”

Section: Introductionmentioning

confidence: 99%